n.

1. 容量，容积[U][S]
   The theater has a seating capacity of 800.

   这个剧场可容纳八百名观众。

2. 能量，生产力[U][S]
   The auto plant now has an annual capacity of 12,000 cars.

   这家汽车厂现在每年能生产一万二千辆汽车。

3. 能力，才能，接受能力，理解力[C][U][（+for）]
   He has a great capacity for learning languages.

   他学语言的能力很强。

4. 资格，地位，职位[C]
   He said that in the capacity as mayor.

   他是以市长的身份说那番话的。

n.

1. the maximum amount that something can contain or produce.
   ▸ [as modifier] fully occupying the available space:

   a capacity crowd.
   ▸the total cylinder volume that is swept by the pistons in an internal-combustion engine.
2. the ability or power to do something.
   ▸a person's legal competence.
3. a specified role or position.
4. dated electrical capacitance.